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WO1999001724A1 - Device for projecting a defined light beam onto a photosensitive area - Google Patents

Device for projecting a defined light beam onto a photosensitive area Download PDF

Info

Publication number
WO1999001724A1
WO1999001724A1 PCT/EP1998/003797 EP9803797W WO9901724A1 WO 1999001724 A1 WO1999001724 A1 WO 1999001724A1 EP 9803797 W EP9803797 W EP 9803797W WO 9901724 A1 WO9901724 A1 WO 9901724A1
Authority
WO
WIPO (PCT)
Prior art keywords
mirror
sun
photosensitive area
light beam
module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP1998/003797
Other languages
French (fr)
Inventor
Heinz Ossenbrink
Willem Zaaiman
Claas Helmke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
European Atomic Energy Community Euratom
European Community EC Luxemburg
Original Assignee
European Atomic Energy Community Euratom
European Community EC Luxemburg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by European Atomic Energy Community Euratom, European Community EC Luxemburg filed Critical European Atomic Energy Community Euratom
Priority to JP50625099A priority Critical patent/JP2002510393A/en
Priority to US09/446,985 priority patent/US6191352B1/en
Priority to CA002288711A priority patent/CA2288711A1/en
Publication of WO1999001724A1 publication Critical patent/WO1999001724A1/en
Priority to NO996537A priority patent/NO996537L/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/08—Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S136/00—Batteries: thermoelectric and photoelectric
    • Y10S136/29—Testing, calibrating, treating, e.g. aging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S136/00—Batteries: thermoelectric and photoelectric
    • Y10S136/291—Applications

Definitions

  • This invention relates to a device for projecting a defined light beam onto a photosensitive area, particularly for testing the performance of a photovoltaic module.
  • Performance tests of this kind require a well defined light beam as far as global intensity, local intensity distribution and spectral composition are concerned.
  • DC photovoltaic modules pulsed simulated light sources are preferred over natural sunlight due to their well-known and constant light spectrum, their stable intensity over the measuring cycle ( about 2 ms ) , their availability over the entire year and the low and constant temperature level to which the module is subjected during the short term test.
  • This device uses as the primary light source the sun but avoids the drawbacks of this choice (variable spectrum and intensity with daytime and annual seasons) by providing adequate control mechanisms.
  • a structure 1 which can be turned about a vertical axis 4 by a motor (not shown) in accordance with the relative sun movement with respect to the location of the device.
  • This structure 1 supports two mirrors:
  • a first mirror 2 is mounted in order to receive the inci- dent sunlight. It can be tilted by a motor (not shown) about a horizontal axis 3 by control means in order to permit a continuous matching with the sun elevation angle. It is shown in two different positions.
  • a second mirror 5 is securely mounted above a horizontal plane which constitutes the photosensitive area 6 where the module is to be tested. It receives the light reflected by the first mirror and is fixed and oriented to direct the incident light vertically down to area 6.
  • the photosensitive area is located inside a cabin 7 incorporating a drawer for housing the module to be tested.
  • This cabin is provided with temperature stabilisation means which ensure a defined low temperature of the area 6 during the entire test cycles. These means are not shown because they are conventional.
  • a roman blind 8 protects the structure against diffused daylight which could falsify the test by contributing to the light irradiation of the area 6. This blind defines the aperture geometry of the first mirror 2.
  • An essential feature of the present invention is the regulation of the light intensity to which the area 6 is subjected.
  • the intensity of sunlight varies with the weather conditions and the daily and seasonal elevation angle evolution.
  • one of the mirrors preferably the first mirror 2 is mounted on a mechanism which is able to vary the convexity or concavity of the mirror surface.
  • the other mirror is preferably a plane mirror, but it can be useful to modify the convexity of both mirrors.
  • Such a mechanism is known and consists in a first embodiment of a gastight chamber 9 of circular cylindrical shape.
  • One of its circular outer surfaces is resilient and constitutes or bears the mirror.
  • This surface can be made more or less concave or convex in accordance with the pressure of the gas supplied to the chamber.
  • This pressure is preferably a vacuum pressure, but it can also be high pres- sure.
  • the gas supply means are not shown because they are conventional.
  • this mechanism consists of a plurality of pushrods each associated to a subarea of the mirror and to individual electromechanical actuators.
  • the spectral light composition as supplied by the sunlight can easily by adapted to the needs by interposing adequate filters in the vertical path of the light beam.
  • monochromatic light of a desired wavelength can be used for the tests in order to study the performance of the module as a function of wavelength.
  • a prototype of the device has an overall height of about 10 m and mirror surfaces or beam cross sections of about 4 m 2 .
  • the device according to the invention supplies test light during several hours per day of sunshine and over the entire year. If in summer the intensity of the sunlight is high the convexity control mechanism enlarges the beam, thus making only a portion of the incident beam fall on the area 6. On the contrary in winter or at cloudy weather the beam section is reduced by the mechanism in order to concentrate all the incident light energy on said area or even only on a central portion thereof which then is the only test zone. Under all conditions the energy distribution is uniform over the respective test area because the light reflexion is practically afocal, the focal length of the variable mirror being in any case long compared to the dimensions of the device.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photovoltaic Devices (AREA)
  • Laser Surgery Devices (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

This invention relates to a device for directing a defined light beam onto a photosensitive area, particularly for testing the performance of a photovoltaic module. According to the invention this device comprises, in a support structure (1) which can be turned about a vertical central axis (4) in accordance with the actual azimuthal sun position, a cabin (7) receiving the module to be tested with the photosensitive area (6) in a horizontal position, the cabin being located in the lower portion of the structure; a first mirror (2) which can be tilted about a horizontal axis (3) in order to adapt its position continuously to the sun elevation position and to optimize the sun light impact thereon; and a second mirror (5) fixed to the structure (1) vertically above the photosensitive area (6) of the module and receiving the light beam from the first mirror (2) for reflection towards said area (6), at least one of said mirrors (2, 5) being associated to a mechanism (8) which allows one to vary the convexity of the mirror in accordance with sun intensity detectors.

Description

DEVICE FOR PROJECTING A DEFINED LIGHT BEAM ONTO A PHOTOSENSITIVE AREA
This invention relates to a device for projecting a defined light beam onto a photosensitive area, particularly for testing the performance of a photovoltaic module.
Performance tests of this kind require a well defined light beam as far as global intensity, local intensity distribution and spectral composition are concerned. For DC photovoltaic modules pulsed simulated light sources are preferred over natural sunlight due to their well-known and constant light spectrum, their stable intensity over the measuring cycle ( about 2 ms ) , their availability over the entire year and the low and constant temperature level to which the module is subjected during the short term test.
However, some new technology modules such as multi- junction solar panels or AC photovoltaic modules require measuring cycles of longer duration for which high intensity artificial light sources are only available at high costs. It is therefore the aim of this invention to conceive an intense light source which is comparatively cheap, which supplies a uniform and defined light intensity on a large area of up to 4 m2 during long lasting test periods and which allows one to keep the module under test at a controlled low temperature.
This aim is achieved according to the invention by the device as defined in claim 1. Preferred embodiments of this device are characterized in the dependent claims.
The invention will now be described in more detail with reference to the annexed drawing which shows schematically a device in accordance with the invention.
This device uses as the primary light source the sun but avoids the drawbacks of this choice (variable spectrum and intensity with daytime and annual seasons) by providing adequate control mechanisms.
In the drawing a structure 1 is shown which can be turned about a vertical axis 4 by a motor (not shown) in accordance with the relative sun movement with respect to the location of the device. This structure 1 supports two mirrors:
- A first mirror 2 is mounted in order to receive the inci- dent sunlight. It can be tilted by a motor (not shown) about a horizontal axis 3 by control means in order to permit a continuous matching with the sun elevation angle. It is shown in two different positions.
- A second mirror 5 is securely mounted above a horizontal plane which constitutes the photosensitive area 6 where the module is to be tested. It receives the light reflected by the first mirror and is fixed and oriented to direct the incident light vertically down to area 6.
The photosensitive area is located inside a cabin 7 incorporating a drawer for housing the module to be tested. This cabin is provided with temperature stabilisation means which ensure a defined low temperature of the area 6 during the entire test cycles. These means are not shown because they are conventional. A roman blind 8 protects the structure against diffused daylight which could falsify the test by contributing to the light irradiation of the area 6. This blind defines the aperture geometry of the first mirror 2.
An essential feature of the present invention is the regulation of the light intensity to which the area 6 is subjected. In fact the intensity of sunlight varies with the weather conditions and the daily and seasonal elevation angle evolution. To this end one of the mirrors, preferably the first mirror 2 is mounted on a mechanism which is able to vary the convexity or concavity of the mirror surface. The other mirror is preferably a plane mirror, but it can be useful to modify the convexity of both mirrors.
Such a mechanism is known and consists in a first embodiment of a gastight chamber 9 of circular cylindrical shape. One of its circular outer surfaces is resilient and constitutes or bears the mirror. This surface can be made more or less concave or convex in accordance with the pressure of the gas supplied to the chamber. This pressure is preferably a vacuum pressure, but it can also be high pres- sure. The gas supply means are not shown because they are conventional.
In another embodiment this mechanism consists of a plurality of pushrods each associated to a subarea of the mirror and to individual electromechanical actuators. The spectral light composition as supplied by the sunlight can easily by adapted to the needs by interposing adequate filters in the vertical path of the light beam. Thus for example monochromatic light of a desired wavelength can be used for the tests in order to study the performance of the module as a function of wavelength.
All the movements necessary to adjust the device to the elevation and azimuthal angle of the sun and to regulate the light intensity by means of the convexity of the variable mirror are controlled according to the users commands by a microprocessor which receives measuring signals from adequate detectors.
A prototype of the device has an overall height of about 10 m and mirror surfaces or beam cross sections of about 4 m2. The device according to the invention supplies test light during several hours per day of sunshine and over the entire year. If in summer the intensity of the sunlight is high the convexity control mechanism enlarges the beam, thus making only a portion of the incident beam fall on the area 6. On the contrary in winter or at cloudy weather the beam section is reduced by the mechanism in order to concentrate all the incident light energy on said area or even only on a central portion thereof which then is the only test zone. Under all conditions the energy distribution is uniform over the respective test area because the light reflexion is practically afocal, the focal length of the variable mirror being in any case long compared to the dimensions of the device.

Claims

CLAIMS 1. A device for directing a defined light beam onto a photosensitive area, particularly for testing the performance of a photovoltaic module, characterized in that it comprises, in a support structure (1) which can be turned about a vertical central axis (4) in accordance with the actual azimuthal sun position,
- a cabin ( 7 ) receiving the module to be tested with the photosensitive area (6)in a horizontal position, the cabin being located in the lower portion of the structure,
- a first mirror ( 2 ) which can be tilted about a horizontal axis (3) in order to adapt its position continuously to the sun elevation position and to optimize the sun light impact thereon,
- and a second mirror ( 5 ) fixed to the structure ( 1 ) vertically above the photosensitive area ( 6 ) of the module and receiving the light beam from the first mirror ( 2 ) for reflexion towards said area ( 6 ) , at least one of said mirrors (2, 5) being associated to a mechanism ( 8 ) which allows one to vary the convexity of the mirror in accordance with sun intensity detectors.
2. A device according to claim 1, characterized in that the cabin (7) is provided with temperature stabilisation means.
3. A device according to claim 1 or 2, characterized in that a microprocessor receives signals from the sun in- tensity detectors and supplies controls to the convexity varying mechanism.
4. A device according to any one of the preceding claims, characterized in that the first mirror (2) is associated to the convexity varying mechanism whereas the second mirror (5) is plane.
5. A device according to any one of the preceding claims, characterized in that the second mirror (5) is associated to the convexity varying mechanism whereas the first mirror (2) is plane.
PCT/EP1998/003797 1997-06-30 1998-06-22 Device for projecting a defined light beam onto a photosensitive area Ceased WO1999001724A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP50625099A JP2002510393A (en) 1997-06-30 1998-06-22 A device that projects a limited light beam onto a photosensitive area
US09/446,985 US6191352B1 (en) 1997-06-30 1998-06-22 Device for projecting a defined light beam onto a photosensitive area
CA002288711A CA2288711A1 (en) 1997-06-30 1998-06-22 Device for projecting a defined light beam onto a photosensitive area
NO996537A NO996537L (en) 1997-06-30 1999-12-29 Device for directing a particular light beam to a photosensitive area

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP97110643A EP0889306B1 (en) 1997-06-30 1997-06-30 Device for projecting a defined light beam onto a photosensitive area
EP97110643.0 1997-06-30

Publications (1)

Publication Number Publication Date
WO1999001724A1 true WO1999001724A1 (en) 1999-01-14

Family

ID=8226976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/003797 Ceased WO1999001724A1 (en) 1997-06-30 1998-06-22 Device for projecting a defined light beam onto a photosensitive area

Country Status (11)

Country Link
US (1) US6191352B1 (en)
EP (1) EP0889306B1 (en)
JP (1) JP2002510393A (en)
AT (1) ATE246345T1 (en)
CA (1) CA2288711A1 (en)
DE (1) DE69723823T2 (en)
DK (1) DK0889306T3 (en)
ES (1) ES2205092T3 (en)
NO (1) NO996537L (en)
PT (1) PT889306E (en)
WO (1) WO1999001724A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9039401B2 (en) 2006-02-27 2015-05-26 Microcontinuum, Inc. Formation of pattern replicating tools
US9307648B2 (en) 2004-01-21 2016-04-05 Microcontinuum, Inc. Roll-to-roll patterning of transparent and metallic layers
EP1905065B1 (en) 2005-06-20 2014-08-13 Microcontinuum, Inc. Roll-to-roll patterning
DE102008053083B4 (en) 2008-10-24 2011-07-28 Pyreos Ltd. Infrared light detector and production thereof
US8845912B2 (en) 2010-11-22 2014-09-30 Microcontinuum, Inc. Tools and methods for forming semi-transparent patterning masks
US9589797B2 (en) 2013-05-17 2017-03-07 Microcontinuum, Inc. Tools and methods for producing nanoantenna electronic devices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905352A (en) * 1973-08-31 1975-09-16 Arnold Jahn System for collecting and transferring usable solar heat
FR2497927A1 (en) * 1981-01-09 1982-07-16 Brych Alfred Concentrating solar collector - has large parabolic mirror formed by supple sheet forming gas-filled chamber with membrane attached to periphery of circular frame
US4641227A (en) * 1984-11-29 1987-02-03 Wacom Co., Ltd. Solar simulator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284839A (en) * 1978-12-18 1981-08-18 Johnson Steven A Internal refractor focusing solar energy collector apparatus and method
US4249516A (en) * 1979-01-24 1981-02-10 North American Utility Construction Corp. Solar energy collection
IL108506A (en) * 1994-02-01 1997-06-10 Yeda Res & Dev Solar energy plant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905352A (en) * 1973-08-31 1975-09-16 Arnold Jahn System for collecting and transferring usable solar heat
FR2497927A1 (en) * 1981-01-09 1982-07-16 Brych Alfred Concentrating solar collector - has large parabolic mirror formed by supple sheet forming gas-filled chamber with membrane attached to periphery of circular frame
US4641227A (en) * 1984-11-29 1987-02-03 Wacom Co., Ltd. Solar simulator

Also Published As

Publication number Publication date
JP2002510393A (en) 2002-04-02
NO996537D0 (en) 1999-12-29
CA2288711A1 (en) 1999-01-14
DE69723823D1 (en) 2003-09-04
NO996537L (en) 1999-12-29
ATE246345T1 (en) 2003-08-15
DE69723823T2 (en) 2004-05-27
PT889306E (en) 2003-12-31
DK0889306T3 (en) 2003-10-27
EP0889306B1 (en) 2003-07-30
ES2205092T3 (en) 2004-05-01
US6191352B1 (en) 2001-02-20
EP0889306A1 (en) 1999-01-07

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